Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

By C. M. Bonilla, J. Herrero‐Albillos, F. Bartolomé, L. M. García, M. Parra-Borderías, V. Franco. 2010

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A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo2, and mixed manganites, La2/3CaxSr1�x1/3MnO3, which exhibit first- and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first-order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/293fa861a9b1f00f6e8ce74a580e894c5e1d9b27